Pneumatic valve-actuating device.



H. W. TERRY & J. W. FOWLER.

PNEUMATIC VALVE ACTUATING DEVICE.

APPLICATION FILED SEPT. 5.191].

1,279,786. Patented Sept. 24,1918.

2 SHEETSSHEET l.

H. w. TERRY & 1. w. FOWLER. PNEUMATIC VALVE ACTUATING DEVICE.

APPLICATION FILED SEPT-,5. 19'1- 1 ,279,786 Patented Sept. 24, 1918.

2 SHEETISSHEET 2.

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' UNITED STATES 'l QFFIQE-I HENRY WM. TERRY AND aonnw. FOWLER, or ro onro, oNrARIo, CANA A.

PNEUMATIC VALVE-ACTUATING DEVICE.

To all whom it may concern:

Be it known that we, HENRY WM. TERRY and JOHN WJLLIAM FowLnR, of the city of Toronto, in'th county of York, Province of Ontario, Canada, have invented certain new and useful Improvements iniPneumatic Valve-Actuating Devices, of which the following is aspecification.

In certain milking apparatus a valve retion of suction and atmospheric pressure in the teat cups. Automatic pneumaticmeans ,"for rec procatingsuch a valve are-now commonly employed, but with such apparatus as now constructed the periods oii suction are each equal in length to anyperlod of atmospheric pressure.

. Our object therefore is to devise means 1 whereby the lengths of the periods of suction and of atmospheric pressure may be .varied at will to increase and decrease the rate of milking andthe ratio of a periodof p 22 in Fig. 5 with the parts in a different at y ' line 3-3 in Fig. 5 with the line H in Fig.

suction to the following periodof atmos pheric pressure.

Weattainour objectby means of the constructions hereinafter described and illustrated in" the accompanying drawings in which 4 g j Figure l is a vertical section of our improved device taken on the line '1--1 in Fig.5;

Fig. 2 a vertical section'taken on the line posltion; v1

Fig. 5 a plan view partly broken away and partly in section showing our device as applied to a pail cover of a milking machine;

and

tive positions ofthe ports.

In the drawings likenumerals ofreference indicate corresponding parts in the dif- Q ferent figures.

1 is a milk pail cover, which in practice fits in an air tight manner on a milk pail, 2 a nipple to which may be connected the hose from a vacuum pump so that a vacuum may be created within the milk pail, and 3 a cylinder which has connected thereto the Specification of Letters Patent.

parts in the 'Figa6 a development of the piston and piston valve showing particularly the rela- Patented Sept. 24, 1918.

Application filed September 5, 1917. Serial No. 189,785.

milk pipe connection 4 and the nipple 5 towhich may be connected a rubber pipe conveyingatmospheric pressure to the teat cups.

6 is a strainerthrough which atmospheric terior'of the pail and the milk pipe connecpressure may pass to the nipple 5 Whenthe valve 7 within the cylinder is in proper 4 position. When the valve is up asshownin ,Fig. 4, there is connection between themquires to be reciprocated to cause alternai tion 4:. When the valve is down, the milk pipe is closed off to vacuum within thepail and thenipple 5 open to atmospheric pressure. This valve 7 is operated by means of a' stud 8 which projects through a slot 9 inthe side of the cylinder 10 and is connected with the hollow piston 11.

The hollow piston is provided with removable ends 12 adapted to be screwed into the piston. Within the piston a piston valve 13 is longitudinally slidable. This piston valve has two annular grooves formed .therein. f I

In the walls of the cylinder 10 are formed the following ports, two vacuum ports 14,

one for each end of the interior of the cylinders; a vacuum port 15 for each .end of the interior of the piston; an air port 16 through which air may pass to each' end of the cylinder as hereinafter The exterior surface of the hollow piston is .providedwith two grooves 18 extending in alinement from a point near each endof the cylinder to a point near the middle.

These grooves are thus entirely separate and register with the vacuum ports 14. From each groove a port 19 extends throughto the interior of the piston.

a .At the opposite side of thecylinder are formed alined grooves 20 extending from a point near the middle of. the piston clear through to each end. From each groove 20 two ports 21 and 22 extend through to the interior of the piston. 1 1

- In the side of the piston is also formed a groove .23, which does not extend through to with ports 27 leading into the interior of the piston adjacent each end. In vertical alineiiientwith the air pofts 17 are formed two ports 28, each port communicating by means of a passage 29 with a port 34 leading; into the interior of the hollow piston in the hollow piston.

just Within its ends. The vacuum ports let and 15 each communicate with a branch of a suction conduit 31 communicating thr'ough the cover with the interior of the pail, so that vacuum created within the pail may operate through the suction conduit. Each branch is controlled by a needle valve 32 so; that the flow of air through either branch may be restricted as may be desired.

The air port 16, it will be noted, is provided with the strainer 83.

The operation of the device is as follows: Assuming the piston to have reached its lower limit of movement, the upper vacuum port 15 comes into alin'ement with the port Tommunication throughthe passage 26 and port 27 is thus formed with the interior of the piston above the piston valve 13. At the same time the lower port 28 is in alinement with the lower air port 17, so that through the port 28', the

passage 29' and the port 34 communication isfestablished between the atmosphere and the under side of the piston valve. As there is a vacuum above this valve, the valve promptly rises. There is then communication between the upper vacuum port M and the upper gioove 18 through the upper port 19, through the upper annular groove of the piston valve, fromthis annular groove through the upper port 22 in the upper groove Q'O'and through this groove to the 1 upper part of the cylinder. Vacuum is thus 40' allowed to act above the piston. 7

Air is admitted to the lower side of the piston; as follows: The air passes through the air port 16 into the groove'23, thence through the air port 24 into the interior of the hollow piston and the lower annular groove of the piston valve. From this 'roove it passes through the port 21 through the lower groove 20 to the 10m end of the piston, which then moves up. When the pistoh' reaches the upper end of its stroke, the iston valve shifts and the piston starts to move down followihg the reversal of the positioiis' of the control. The reciprocating movement of the piston will thus be maintained as long as suction exists in the suction cases at thi patent-may be bbt'aizied in fi'v'e cents steamy waimin wa, m. c."

of our invention as long as the independeiit control of thesuction at the opposite ends of the piston is retained.

That We claim as our invention'is a 1. The combniatlon of a cylinder; hol- 10w piston movable therein-; a piston Valve movable in the hollow piston; the cylinder being provided witha vacuum ort for each end of the cylinder, avacuum-port for. each end of the interior of the piston; and air ports for each enact the cylinder and" each end of the-interior of the piston] the piston being adapted to control the portstoc'hange the-posltlon of the piston valveand the piston valve in cooperation with the piston to control the opening of the' cylinder at its opposite ends to vaeuurn' or atmospheric pressure; and means for lndependently controlling the vaccum ports for the cylinder ends.

2. The combination of a cylinder; a hollow piston movable therein; a piston valve movable in the hollow piston, the cylinder being provided with a vacuum, port for each end of the cylinder, a vacuum port for each end of the interior of the pistomand air ports for each end of the cylinder andeach end of the interior of the piston, the piston being adapted to controlthe ports to change the position of the piston valve and. the

piston valve in cooperation with thepiston to control the openin oflthe cylinder at its opposite ends. to vacuunror atmospheric pressure; a suction conduit having two branches each branch serving a vacuum port hollow piston; and two valv'cs each controllin one.of said branches.

S gnedat Toronto this 28th day of May,

HENRY WM. TERRY.

JOHN w. FOWLER.

. for the cylinder and a vacuum port for the 

